Wastewater Treatment

wastewater treatment

Aeration Basin

Aeration Basin

Biological Treatment

Biological processes are most important unit operations in wastewater treatment. Biological treatment systems are living systems that rely on mixed biological cultures of bacteria and fungi to break down waste organics and remove them from solution. A treatment unit provides a controlled environment for the desired biological process.

Aerobic treatment: Aerobic techniques transform the organic pollution into carbon dioxide and biomass. This biological process requires oxygen, which can be provided by either surface or submerged aeration.

As a function of the wastewater to be treated, FARAN Process and Energy Engineering Company selects the most appropriate technique, such as activated sludge treatment (Conventional, Extended aeration, ….) or fixed biomass reactor (tricking filter and rotary biological contactor).

In case low discharge standards are to be met, or for the purpose of recycling, a post treatment (by means of filtration, disinfection, sulphide oxidation….) may be needs after the biological treatment.

Anaerobic Treatment: Anaerobic techniques use bacteria (in the absence of oxygen) to eliminate the organic pollution in wastewater and are also used to relieve existing aerobic plants, such as when extending the production. During this process, biogas is generated, which can be used as fuel for steam, hot water or electricity production.

Other advantages of the anaerobic techniques are: the compactness, the moderate operating costs and especially the extremely low excess sludge production, which can even be sold as for instance seed sludge for other customers.

In the anaerobic field, FARAN´s expertise allows us to select the optimum reactor type for each wastewater as well as UASB, EGSB, ECSB, and ... .


sewage Treatment Package

Package plants are pre-manufactured treatment facilities used to treat wastewater in small communities or on individual properties, for example, hotels, station, hospitals, construction site, etc.

There is several treatment processes available in package form. Following system are available from FARAN Process and Energy Engineering Company:

  • Extended Aeration Activated Sludge
  • Sequencing Batch Reactor (SBR)
  • Integrated Fixed Film Activated Sludge (IFAS)
  • Rotating Biological contactor (RBC)
  • Trickling Filter & Bio tower

Extended Aeration is one modification of the suspended growth activated sludge process which provides biological treatment for the removal of biodegradable organic wastes under aerobic conditions. Air may be supplied by mechanical or diffused aeration to provide the oxygen required to sustain the aerobic biological process. Mixing must be provided by aeration or mechanical means to maintain the microbial organisms in contact with the dissolved organics. In addition, the pH must be controlled to optimize the biological process and essential nutrients must be present to facilitate biological growth and the continuation of biological degradation.

Wastewater enters the treatment system and is typical screened immediately to remove large suspended, settleable or floating solids that could interfere with or damage equipment downstream in the process. Wastewater may than pass through a grinder to reduce large particles that are not capture in the screening process. If the plant requires the flow to be regulated, the effluent will then flow into equalization basins which regulate peak wastewater flow rates. Wastewater then enters the aeration chamber, where it is mixed and oxygen is provided to the microorganisms. The mixed liquor then flows to a clarifier or settling chamber where most microorganisms settle to the bottom of the clarifier and a portion are pumped back to the incoming wastewater at the beginning of the plant. This returned material is the return activated sludge (RAS). The material that is not returned, the waste activated sludge (WAS), is removed for treatment and disposal. The clarified wastewater then flows over a weir and into a collection channel before being diverted to the disinfection system.

Extended aeration package plants consist of a steel tank that is compartmentalized into flow equalization, aeration, clarification, disinfection, and aerated sludge holding/ digestion segments. Extended aeration systems are typically manufactured to treat wastewater flow rates between 10 to 100 m3/day.

Sequencing Batch Reactor (SBR): FARAN SBRs Packages treatment process is a type of activated sludge system that incorporates aeration, clarification, effluent decanting, and sludge wasting into a single vessel. An SBR is operated in batch mode through fill, aerate, settle, and decant/waste phases. The vessel can be a tank, a basin, or even a lagoon. FARAN’s SBR systems are well-suited for facilities needing biological treatment in a compact, easy-to-operate system. The system is well suited for the treatment of a moderate concentration BOD5 waste stream with low concentrations of product TSS and O&G.

Integrated Fixed Film Activated Sludge (IFAS): IFAS is a fixed film aerobic process that uses a random pack carrier media for the attachment of biomass in an aerated reactor. Like an IPAC, an IFAS uses a DAF for clarification of biosolids coming from the aerated reactor. FARAN IFAS’s packages are well suited for the treatment of a moderate to high concentration BOD5 waste stream with low concentrations of product TSS and O&G and with small footprint requirement.


Industrial wastewater treatment

The treatment of wastewater produced by many industrial processes has never been subjected to a similar level of environmental pressure than that found today, coming from the public, pressure groups and indeed public bodies of all kinds.

FARAN Process and Energy Engineering Company can and does play a vital role in this area by bringing its unrivalled effluent treatment expertise into partnership with industry.

It can help to reduce high treatment costs yet maintain high performance to meet the needs of modern plant processes and can also help to ensure that industry operates in harmony with its local environmental rules.

Our range of industrial wastewater treatment solutions is applicable for wide variety of effluents generated by oil & gas refineries, petrolchemical, pharmaceutical, food processing, steel production and metal finishing, power plants, etc.


Oil Separation

Streams of oily wastewater are frequent within industry, however, that does not mean we should be complacent about them.Common sources of contamination are petroleum derivatives and fats from vegetable and meet processing. Dedicated solutions have been developed by FARAN Process and Energy Engineering Company employing the following technologies:

API Pits(static gravity separator):These rely heavily on gravity and perhaps represent the original, simplest and lowest cost of separating certain amounts of oils/solids prior to discharge to the sewer.

The method of operation is that effluent/contaminated water enters the vessel (tank/compartments(s)) where it must sit undisturbed for a prolonged period of time, oil eventually floats to the top of the holding tank.

Parallel/Coalescing Plate Separators(CPI Separator): These separators arguable represent second-generation systems for the waste/effluent treatment of oil/ solids contaminated water prior to discharge to sewer.

They consist of a chamber containing; a pack of narrowly separated paralleled plates stacked one above the other (usually fiberglass or stainless steel plates) usually with the plates inclined so as not to impede flow. The method of operation is that effluent/waste water flow smoothly between the plates with a minimum of turbulence/disturbance. Oil coalesces or ‘sticks’ on the surface of the plate above and travels to the opposite opening between the plates.

The coalesced oil then migrates to the bulk of oil at the top of the chamber.

By comparison with settling tanks, oil may have to rise many centimeters to coalesce whereas in a plate pack coalescence occurs between the plates which may be only a couple of centimeters. Some newer designed plate separators are even more compact.